Mechanical stoker.



E. A. WALL. MECHMNMI. STOKEB. -::\WLICMBONM1W sun: a. me.

Patentedi Nov. 14,1916.

E. A. WALL.

MECHANICAL STOKER.

MPUCATION FILED JUNE 9.191s.

Pqtented Nw. 14,1916.-

mma

' 2 SHEETS-SHEET 2- an snares earner orsion,

ENDS A. WALL, OF SALT LAKE CITY, UTAH.

MECHANICAL STOKER.

Specification of Letters Patent.

Application filed June 9, 1916. Serial No. 102,739.

.a furnace flame in the form of a continuous stream or sheet, controllable in volume, and in such a manner as to avoid all danger of explosion or combustion of the highly inflammable dust above or outside of the fur nace opening. I have found that such explosions will be prevented by forming the delivery chute in angular tubular form with its forward end delivering into the furnace and with its rear upper end inclosing the lower delivery end of a supply hopper so that as fast as the fuel is discharged a correspending amount replaces it, thereby keeping the chute filled at all times. The lower end of the main supply hopper dip-seals into the fuel in the upper end of the chute so that the body of fine fuel is always un brokenor continuous from end to end of the chute'and the entrance of air into the chute and through the mass of fuel is absolutely prevented. This object I accomplish by the construction shown in the accompanying drawing, in which:

Figure 1 shows, inside elevation, a mechanical stoker containing my improvements, and Fig. 2 is an end elevation A designates a suitable framework within the upper end ofwhich is mounted a main supply hopper A having at its lower end a delivery spout a. This spout a dip-seals into the upper rear end of the chute B, suspended within the frame by means of the four flexible cables F, having turnbuckles H, by means of which-the chute may be adjusted at the proper angle.

The chute B is in the form of an angular tapering tube or trunk arranged horizontally and having a downwardly inclined contracted outlet 13', which extends within the furnace opening, not shown.

In my construction it willbe noticed that the upper wall of the iiorizontal portion of the boot-like or angu ar chute is inclined downward from the front wall of its vertie cal portion, at an angle of about 20 to the point of discharge B; This insures a constant supply of coal dust from the higher elevation in the vertical portion of the chute, which dust instantly takes the place of the dust that is fed forward in the degrees,

Patented Nov. 141., rate;

horizontal portion in response to the motion of the operating mechanism, thus keeping the entire chute effectually sealed against the intrusion of air at the discharge end B. A chute in the form of a straight pipe of even diameter could not accomplish the above result, for the reason that sucha.pipe

filled with dust would, when recipr0cated,-

feed the dust faster along the upper side of the tube than at its bottom, owing to the greater friction of the dust at the bottom,

V and this would produce and maintain an air filled space within and along the upper portion of such pipe and so subject the contents of the pipe and its supply to explosion. This is entirely avoided by the inclined top wall of the horizontal part of the chute.

The chute B is given a short horizontal reciprocation, terminating in a forward bump to suddenly eject a certain amount of fuel from outlet B. This movement may be imparted in any desired manner, but I have found the mechanism shown a very efficient one for the purpose. This reciprocatory bumping mechanism is fully set forth in my Patent 1,011,680, December 12, 1911, and will, therefore, only be briefly referred to as follows: 1 indicates the eccentric, 2, 2 the divided pitman, the forward end of the section 2 of which is pivotally connected to the lower rear end of the chute B, as shown at 6; the outer end of the section '2 being connected to the strap of the eccentric 1. The two sections of the pitman are yieldingly connected by a yoke I), carried by section 2, and bearing against springs 4, 4 on the'section 2. The section 2 of the pitman has a butler nut 7 which acts against a bu tl'er or bumper bar E, fixed on the frame A. The forward movement of the chute'B will be suddenly arrested by the contact of the nut 7 with bumper bar E, and this sudden bump or jar at ,the rear end of the chute acts to project from its nozzle or outlet B desce.

ding from the hopper A keeps the chute full at all times and the fuel. cannot overflow from the upper end of the chute, owing to the dip-seal there formed. The par a ill be so proportioned or regulated that-the how of fuel will be continuous and the proper amount delivered to the furnace. The speed of the operating mechanism, the extent oi throw and the force of the blow of the nut 7 against the bar E may all be adjusted to regulate the How of fuel through the chute B to the furnace.

The above described Stoker may be adapted to feed other substances than fine fuel to furnaces, and various changes Within the scope of my invention may be made.

\Vhat I claim is:

-l. A mechanical stoker comprising a horizontally disposed angular tubular chute having an inlet at the upper end of its upright portion and an outlet at the forward end of its horizontal portion; said horizoutal portion being tapered toward its outlet .for the purpose described, and means for imparting a reciprocatory bumping action to the chute.

2. A mechanical stoker comprising a horizontally disposed angular tubular chute open at its upper end and having a discharge at its forward end; the top Wall of the horizontal member of the chute being tapered from the upright member or leg of the chute down to the said discharge, means for constantly supplying the chute, and means for imparting a reciprocatory bumping motion to the chute.

3. A. mechanical stoker comprising a horizontally suspended angular chute having a. fiat bottom and a top Wall tapering forwardly to the point of discharge B, afixed hopper having a lower contracted end dip scaling in the open upper end of the up right member or leg of the chute, and means for in) )artin a reci )rocal bum Jinn action to the chute.

In testimony whereof I athx my signature.

E. A. WALL. 

